The presence of cold Jupiters may strongly influence the formation and survival of inner low-mass companions, yet the observational evidence remains incomplete. Radial-velocity (RV) surveys provide the most direct approach to probe this connection, enabling searches for short-period sub-Neptunes and super-Earths in systems already known to host long-period giants. Although high-precision,...
It is believed that Jupiter played a significant role in the history of the Solar System’s terrestrial planets, likely affecting their mass, volatile budget and orbits. The detection of complete Solar System analogs around other stars is not currently within reach, yet we can still learn about the history of both ours and other systems’ architecture by investigating the "outer giant planet -...
Despite the great advancements made in the exoplanetary field over the last decades, it is not yet clear whether our Solar System's architecture is common. To shed light on this topic, the GAPS team in 2012 started a program aimed at monitoring 16 systems known to host giant planets on a Jupiter-like orbit to detect potential inner smaller companions. After 13 years of observations and a few...
Studies from recent years have reached different conclusions regarding how frequently super-Earths are accompanied by long-period giant planets and vice versa. This relation has been predicted to be mass dependent by planet-formation models. We investigate that as the origin of the discrepancy using a radial velocity sample: the California Legacy Survey. We perform detection completeness...
A defining feature of our Solar System is the presence of multiple giant planets beyond the snowline, yet this architecture appears to be uncommon: only ~6% of stars are known to host Jupiter-like planets between 1–10 AU. Moreover, the Jovian analogs we do find are typically closer in and more eccentric than Jupiter or Saturn, raising questions about the long-term survivability of inner...
We present the identification and characterization on new scaled Solar-System analog, based on intensive radial velocity monitoring performed with HARPS-N at TNG and additional literature datasets. The system includes a previously known giant planet in a moderately wide orbit, a newly discovered one in a Jupiter-like orbit, and additional low-mass planet candidates from TESS light curves and...
Long-period planets play an important role in their systems, as they can interact with material and small mass planets, and modify their orbits. These modifications can result in dynamical instabilities within the system. One such system is that of Tabby’s star. Its Kepler light curve shows unusual dips with no clear periodicity or cause. The most plausible explanation is a family of...
The growing field of comparative exoplanetology increasingly relies on the synergistic combination of detection techniques with complementary sensitivity domains to fully characterize planetary system architectures. Yet, estimates of exoplanet occurrence rates often remain constrained by the detection capabilities of individual instruments, surveys, or techniques. The resulting heterogeneity...
The dynamical stability of planets with outer giant companions depends on the parameters of the outer companion(s). The inclusion of constraints from stability in the calculation of detection limits can in principle help rule out regions of parameter space where inner planets could not exist in individual systems. We will present preliminary results from a project where, using a synthetic...
The exact role of outer giant planets in the formation of super-Earths and sub-Neptunes remains unclear. Observationally, measuring occurrence rates of these planet populations brings crucial insights, and RV surveys play a major role in this effort. While large sample sizes are key to obtain precise occurrence rates, strong detection limits on each system are equally important. Commonly, RV...
